ES2710825T3 - Circulating fluidized bed with secondary air nozzles in the furnace - Google Patents
Circulating fluidized bed with secondary air nozzles in the furnace Download PDFInfo
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- ES2710825T3 ES2710825T3 ES10179170T ES10179170T ES2710825T3 ES 2710825 T3 ES2710825 T3 ES 2710825T3 ES 10179170 T ES10179170 T ES 10179170T ES 10179170 T ES10179170 T ES 10179170T ES 2710825 T3 ES2710825 T3 ES 2710825T3
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- fluidized bed
- circulating fluidized
- reaction chamber
- secondary air
- bubbling
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/12—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated exclusively within the combustion zone
- F23C10/14—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated exclusively within the combustion zone the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
- F23L9/06—Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air into the fire bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
- F23C2206/103—Cooling recirculating particles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
Una caldera de lecho fluidizado circulante que comprende: una cámara de reacción de lecho fluidizado circulante que tiene paredes laterales (2a-2d) y una rejilla (9) que define un suelo en un extremo inferior de la cámara de reacción de lecho fluidizado circulante para proporcionar gas fluidizante (8, 45, 46) en la cámara de reacción de lecho fluidizado circulante; un lecho fluidizado burbujeante (4) ubicado dentro de una porción inferior de la cámara de reacción de lecho fluidizado circulante que se limita por una o más de las paredes laterales de la cámara de reacción de lecho fluidizado circulante, el suelo de la cámara de reacción de lecho fluidizado circulante, y un pared de cerramiento (30) formada por tubos enfriados que se extienden hacia arriba desde el suelo del lecho fluidizado circulante a una altura del lecho fluidizado burbujeante; al menos un intercambiador de calor en lecho controlable (3) sumergido en el lecho fluidizado burbujeante, el intercambiador de calor en lecho que comprende una superficie de calentamiento y ocupa parte del suelo de cámara de reacción de lecho fluidizado circulante y que se rodea por la pared de cerramiento y una o más de las paredes laterales; y caracterizado por que comprende además al menos una boquilla de aire secundaria en el horno (55) formada por tubos enfriados (50) de la pared de cerramiento de lecho fluidizado burbujeante que se forman en al menos un grupo que se extiende desde una parte superior de la pared de cerramiento de lecho fluidizado burbujeante por la anchura del lecho fluidizado burbujeante hasta alcanzar una de las paredes laterales del lecho fluidizado circulante, las boquillas de aire secundarias (55) que proporcionan así que el aire introducido por las boquillas de aire secundarias no desvíe sólidos (18, 19) para que caigan sobre el lecho fluidizado burbujeante.A circulating fluidized bed boiler comprising: a circulating fluidized bed reaction chamber having side walls (2a-2d) and a grid (9) defining a floor at a lower end of the circulating fluidized bed reaction chamber for providing fluidizing gas (8, 45, 46) in the circulating fluidized bed reaction chamber; a bubbling fluidized bed (4) located within a lower portion of the circulating fluidized bed reaction chamber that is limited by one or more of the side walls of the circulating fluidized bed reaction chamber, the floor of the reaction chamber of circulating fluidized bed, and a wall of enclosure (30) formed by cooled tubes extending upwards from the floor of the circulating fluidized bed at a height of the bubbling fluidized bed; at least one controllable bed heat exchanger (3) submerged in the bubbling fluidized bed, the bed heat exchanger comprising a heating surface and occupies part of the circulating fluidized bed reaction chamber floor and which is surrounded by the enclosure wall and one or more of the side walls; and characterized in that it also comprises at least one secondary air nozzle in the furnace (55) formed by cooled tubes (50) of the enclosed wall of bubbling fluidized bed that are formed in at least one group extending from a top of the enclosing wall of bubbling fluidized bed by the width of the bubbling fluidized bed until one of the lateral walls of the circulating fluidized bed is reached, the secondary air nozzles (55) which thus provide that the air introduced by the secondary air nozzles does not divert solids (18, 19) so that they fall on the bubbling fluidized bed.
Description
DESCRIPCIONDESCRIPTION
Lecho fluidizado circulante con boquillas de aire secundarias en el hornoCirculating fluidized bed with secondary air nozzles in the furnace
CampoField
La presente invencion se refiere en general al campo de los reactores o calderas de lecho fluidizado circulante (CFB) tal como las usadas en instalaciones de generacion de potencia electrica o industrial, y en particular pero no en exclusiva, a boquillas de aire secundarias en el horno disenadas para evitar el desvfo de solidos que caen en el lecho fluidizado burbujeante (BFB) desde el CFB mediante chorros de aire secundarios.The present invention relates in general to the field of circulating fluidized bed reactors or boilers (CFB) such as those used in electric or industrial power generating installations, and in particular but not exclusively, to secondary air nozzles in the oven designed to prevent the diversion of solids that fall into the bubbling fluidized bed (BFB) from the CFB by means of secondary air jets.
AntecedentesBackground
La Patente de Estados Unidos n.° 6.532.905 de Belin et al. describe una caldera CFB con intercambiador de calor en lecho controlable (IBHX). La caldera comprende una camara de reaccion CFB asf como un intercambiador de calor BFB ubicado dentro de la camara de reaccion. La transferencia de calor en el intercambiador de calor se controla mediante el control del mdice de descarga de solidos desde la parte inferior del BFB en la camara de reaccion. La capacidad de transferencia de calor general del IBHX depende del flujo descendente de solidos en la parte superior del lecho burbujeante en el IBHX desde el horno CFB. Un mdice de flujo descendente superior resulta en una capacidad de transferencia de calor superior. El aire secundario se suministra normalmente a un horno CFB mediante boquillas ubicadas en las paredes de horno delantera y trasera. Las boquillas se ubican fuera del cerramiento del horno y sus aberturas de salida estan alineadas con esas paredes. Ya que el IBHX esta ubicado adyacente a las paredes que contienen las boquillas, los chorros desde las boquillas desviaran parte del flujo descendente de solidos desde el IBHX reduciendo asf su capacidad de transferencia de calor.U.S. Patent No. 6,532,905 to Belin et al. describes a CFB boiler with controllable bed heat exchanger (IBHX). The boiler comprises a CFB reaction chamber as well as a BFB heat exchanger located inside the reaction chamber. The heat transfer in the heat exchanger is controlled by controlling the solids discharge rate from the bottom of the BFB in the reaction chamber. The general heat transfer capacity of the IBHX depends on the downward flow of solids in the upper part of the bubbling bed in the IBHX from the CFB furnace. A higher downflow index results in a higher heat transfer capacity. The secondary air is normally supplied to a CFB furnace by means of nozzles located in the front and rear furnace walls. The nozzles are located outside the furnace enclosure and their exit openings are aligned with those walls. Since the IBHX is located adjacent to the walls containing the nozzles, the jets from the nozzles will divert some of the downward flow of solids from the IBHX thus reducing its heat transfer capacity.
La Patente de Estados Unidos n.° 5.836.257 de Belin et al. describe un horno CFB con un pleno de aire secundario integral. Tal pleno permite colocar boquillas de aire secundarias dentro del horno evitando asf la interferencia de sus chorros con el flujo descendente de solidos al IBHX. Sin embargo, la estructura de soporte y/o el medio de suministro de aire del pleno puede interferir con el movimiento de gas y/o solidos en el horno, y acomodar boquillas del tamano suficiente para permitir una penetracion de chorro adecuada en un CFB grande requiere que el pleno sea mucho mayor de lo aconsejable.U.S. Patent No. 5,836,257 to Belin et al. describes a CFB furnace with an integral secondary air plenum. Such a plenum allows secondary air nozzles to be placed inside the furnace thus avoiding the interference of its jets with the downward flow of solids to the IBHX. However, the support structure and / or plenum air supply medium can interfere with the movement of gas and / or solids in the furnace, and accommodate nozzles of sufficient size to allow adequate jet penetration into a large CFB requires that the plenary session be much greater than advisable.
El documento US 5.054.436 describe un sistema de combustion de lecho fluidizado de acuerdo con el preambulo de la reivindicación 1 y un metodo en el que una seccion de reciclado se ubica integralmente con la seccion de horno en un cerramiento y opera como una camara de combustion. Unas superficies de intercambio de calor se proporcionan en el al menos un compartimento de la camara de combustion/intercambiador de calor para retirar calor de los solidos, y un compartimento de desvm se proporciona a traves del que los solidos pasan directamente al horno durante el inicio y las condiciones de carga baja. El aire fluidizante se descarga en la recirculacion interna de los solidos y una division se ubica en la porcion central del cerramiento de horno para introducir aire secundario. Este documento no ensena, al menos, al menos una boquilla de aire secundaria en el horno (55) formada por tubos enfriados (50) de una pared de cerramiento de lecho fluidizado burbujeante que se forman en al menos un grupo que se extiende desde la parte superior de la pared de cerramiento de lecho fluidizado burbujeante por la anchura del lecho fluidizado burbujeante hasta alcanzar una pared exterior del lecho fluidizado circulante, las boquillas de aire secundario que proporcionan que el aire introducido por las boquillas de aire secundario no desvfe solidos y caigan sobre el lecho fluidizado circulante.US 5,054,436 discloses a fluidized bed combustion system according to the preamble of claim 1 and a method in which a recycle section is integrally located with the furnace section in an enclosure and operates as a plenum chamber. combustion. Heat exchange surfaces are provided in the at least one compartment of the combustion chamber / heat exchanger to remove heat from the solids, and a trap compartment is provided through which the solids pass directly to the furnace during initiation. and the conditions of low load. The fluidizing air is discharged in the internal recirculation of the solids and a division is located in the central portion of the furnace enclosure to introduce secondary air. This document does not teach, at least, at least one secondary air nozzle in the furnace (55) formed by cooled tubes (50) of a bubbling fluidized bed enclosure wall which are formed in at least one group extending from the upper part of the bubbling fluidized bed wall enclosing the width of the bubbling fluidized bed until reaching an outer wall of the circulating fluidized bed, the secondary air nozzles which provide that the air introduced by the secondary air nozzles does not deviate solid and fall on the circulating fluidized bed.
SumarioSummary
La presente invencion se ha realizado con conocimiento de los inconvenientes y limitaciones de los sistemas convencionales.The present invention has been made with knowledge of the drawbacks and limitations of conventional systems.
Los aspectos particulares y realizaciónes de la invencion se exponen en las reivindicaciones independientes y dependientes adjuntas.The particular aspects and embodiments of the invention are set forth in the appended independent and dependent claims.
Visto desde un primer aspecto, se proporciona un sistema para impedir, inhibir o evitar el desvm de los solidos que caen en un lecho fluidizado burbujeante desde un lecho fluidizado circulante mediante chorros de aire secundarios mientras se evita una estructura complicada que interferina con el movimiento de gas y/o solidos en un horno.Viewed from a first aspect, a system is provided for preventing, inhibiting or preventing the removal of solids falling into a bubbling fluidized bed from a circulating fluidized bed by secondary air jets while avoiding a complicated structure interfering with the movement of the fluid. gas and / or solids in an oven.
Visto desde otro aspecto, puede proporcionarse una caldera de lecho fluidizado circulante (CFB) que comprende: una camara de reaccion CFB que tiene paredes laterales y una rejilla que define un suelo en un extremo inferior de la camara de reaccion CFB para proporcionar gas fluidizante en la camara de reaccion CFB; un lecho fluidizado burbujeante (BFB) ubicado dentro de una porcion inferior de la camara de reaccion CFB y que se limita por las paredes exteriores de la camara de reaccion CFB, el suelo de la camara de reaccion CFB y las paredes de cerramiento formadas por tubos enfriados que se extienden hacia arriba desde el suelo del CFB a la altura del BFB; al menos un intercambiador de calor en lecho controlable (IBHX), el IBHX comprendiendo una superficie de calentamiento y ocupando parte del suelo de la camara de reaccion CFB y que se rodea por las paredes de cerramiento del BFB; y al menos una boquilla de aire secundaria en el horno formada por tubos enfriados de la pared de cerramiento BFB que se forman en al menos un grupo que se extiende desde la parte superior de la pared de cerramiento BFB por la anchura del BFB hasta alcanzar la pared exterior del CFB.Viewed from another aspect, a circulating fluidized bed (CFB) boiler can be provided comprising: a CFB reaction chamber having side walls and a grid defining a floor at a lower end of the CFB reaction chamber to provide fluidizing gas in the CFB reaction chamber; a bubbling fluidized bed (BFB) located within a lower portion of the CFB reaction chamber and which is limited by the outer walls of the CFB reaction chamber, the floor of the CFB reaction chamber and the enclosure walls formed by tubes cooled that extend upwards from the floor of the CFB to the height of the BFB; at least one controllable bed heat exchanger (IBHX), the IBHX comprising a heating surface and occupying part of the floor of the CFB reaction chamber and which is surrounded by the walls of the closing of the BFB; and at least one secondary air nozzle in the furnace formed by cooled tubes of the enclosing wall BFB which are formed in at least one group extending from the upper part of the enclosing wall BFB by the width of the BFB until reaching the exterior wall of the CFB.
Los tubos que forman la al menos una boquilla de aire secundaria en el horno pueden volverse parte de la pared exterior cuando alcanzan la pared exterior del CFB. Adicionalmente, la abertura de salida de la al menos una boquilla de aire secundaria en el horno puede estar alineada, o casi alineada, con la pared de cerramiento del BFB. Las diversas caractensticas de novedad proporcionadas por la invencion se senalan con particularidad en las reivindicaciones adjuntas a y que forman una parte de esta divulgacion. Para un mejor entendimiento de la invencion, sus ventajas operativas y beneficios espedficos logrados por los usos, se hace referencia a los dibujos adjuntos y materia descriptiva en la que las realizaciónes de ejemplos se ilustran.The tubes forming the at least one secondary air nozzle in the furnace may become part of the outer wall when they reach the outer wall of the CFB. Additionally, the outlet opening of the at least one secondary air nozzle in the furnace may be aligned, or nearly aligned, with the enclosure wall of the BFB. The various features of novelty provided by the invention are pointed out with particularity in the claims appended to and forming a part of this disclosure. For a better understanding of the invention, its operational advantages and specific benefits achieved by the uses, reference is made to the accompanying drawings and descriptive matter in which the embodiments of examples are illustrated.
Breve descripcion de los dibujosBrief description of the drawings
La Figura 1 es una vista en alzado lateral en seccion de una caldera CFB que ilustra boquillas de aire secundarias;Figure 1 is a sectional side elevational view of a CFB boiler illustrating secondary air nozzles;
la Figura 2 es una vista en planta en seccion de la caldera CFB de la Figura 1, vista en la direccion de las flechas 2-2 de la Figura 1;Figure 2 is a sectional plan view of the CFB boiler of Figure 1, seen in the direction of the arrows 2-2 of Figure 1;
la Figura 3 es una vista en perspectiva esquematica del cerramiento BFB, donde los tubos que forman las boquillas de aire secundarias en el horno se representan como lmeas unicas;Figure 3 is a schematic perspective view of the BFB enclosure, where the tubes forming the secondary air nozzles in the furnace are shown as single lines;
la Figura 4 es una vista en alzado lateral en seccion de una caldera CFB de acuerdo con otra realización; y la Figura 5 es una vista en planta en seccion de la caldera CFB de la Figura 4 vista en la direccion de las flechas 5-5 de la Figura 4.Figure 4 is a sectional side elevational view of a CFB boiler according to another embodiment; and Figure 5 is a sectional plan view of the CFB boiler of Figure 4 seen in the direction of arrows 5-5 of Figure 4.
Aunque la invencion es susceptible de tener diversas modificaciones y formas alternativas, las realizaciónes espedficas se muestran solo a modo de ejemplo en los dibujos y se describen en detalle en este caso. Debena entenderse sin embargo que los dibujos y la descripcion detallada en este caso no pretenden limitar la invencion a la forma particular divulgada, sino al contrario, la invencion debe cubrir todas las modificaciones, equivalentes y alternativas que entran dentro del alcance de la presente invencion como se define por las reivindicaciones adjuntas. Descripcion detalladaAlthough the invention is susceptible to various modifications and alternative forms, the specific embodiments are shown by way of example only in the drawings and are described in detail in this case. It should be understood however that the drawings and the detailed description in this case are not intended to limit the invention to the particular form disclosed, but on the contrary, the invention must cover all modifications, equivalents and alternatives that come within the scope of the present invention as is defined by the appended claims. Detailed description
La presente invencion se refiere en general al campo de los reactores o calderas de lecho fluidizado circulante (CFB), tal como aquellas usadas en instalaciones de generacion de potencia electrica o industrial y en particular pero no en exclusiva, a boquillas de aire secundario en el horno disenadas para evitar el desvfo de los solidos que caen en el BFB desde el CFB mediante chorros de aire secundario.The present invention relates in general to the field of circulating fluidized bed reactors or boilers (CFB), such as those used in electric or industrial power generation installations and in particular but not exclusively, to secondary air nozzles in the oven designed to avoid the deviation of the solids that fall into the BFB from the CFB by means of secondary air jets.
Tal como se usa en este caso, el termino caldera CFB se usara para referirse a reactores o camaras de combustion CFB en las que un proceso de combustion tiene lugar. Aunque la presente invencion es aplicable a y se explica en el contexto de calderas o generadores de vapor que emplean camaras de combustion CFB como el medio por el que se produce calor, se entiende que la presente invencion puede emplearse facilmente en un tipo diferente de reactor CFB. Por ejemplo, la invencion podna aplicarse en un reactor que se emplea para reacciones qrnmicas diferentes de un proceso de combustion, o donde una mezcla de gas/solidos desde un proceso de combustion que ocurre en otro lugar se proporciona al reactor para procesamiento adicional.As used in this case, the term CFB boiler will be used to refer to CFB combustion reactors or chambers in which a combustion process takes place. Although the present invention is applicable to and explained in the context of steam boilers or generators that use CFB combustion chambers as the means by which heat is produced, it is understood that the present invention can be easily employed in a different type of CFB reactor. . For example, the invention could be applied in a reactor that is used for different chemical reactions of a combustion process, or where a gas / solids mixture from a combustion process occurring elsewhere is provided to the reactor for further processing.
En referencia ahora a los dibujos, en los que los numeros de referencia similares designan los elementos iguales o funcionalmente similares a traves de los varios dibujos, y a la Figura 1 en particular, una vista en alzado lateral en seccion de un horno CFB 1 se muestra que comprende paredes 2 y un IBHX 3 sumergido en un BFB 4. El CFB se compone predominantemente de solidos que se conforman de la ceniza de la combustion del combustible 5, sorbente sulfatado 6 y, en algunos casos, material inerte externo 7 suministrado a traves de al menos una de las paredes 2 y fluidizado por el aire primario 8 suministrado a traves de la rejilla de distribucion 9. Algunos solidos se atrapan por los gases que resultan de la combustion del combustible y se mueven hacia arriba 15 eventualmente alcanzando un separador de partfculas 16 en la salida del horno. Aunque algunos de los solidos 17 pasan por el separador, la masa de ellos 18 se captura y se recicla de vuelta al horno. Esos solidos junto con otros 19, que caen fuera de la corriente de solidos corriente arriba 15, se suministran al BFB 4 que se esta fluidizando mediante el medio fluidizante 25 suministrado a traves de una rejilla de distribucion 26. Los medios para retirar solidos del CFB y del BFB (27 y 28 respectivamente) se proporcionan en las areas pertinentes del suelo de horno.Referring now to the drawings, in which similar reference numbers designate the same or functionally similar elements throughout the various drawings, and to Figure 1 in particular, a sectional side elevation view of a CFB 1 furnace is shown comprising walls 2 and an IBHX 3 immersed in a BFB 4. The CFB is composed predominantly of solids that are formed from the ash of fuel combustion 5, sulfated sorbent 6 and, in some cases, external inert material 7 supplied through of at least one of the walls 2 and fluidized by the primary air 8 supplied through the distribution grid 9. Some solids are trapped by the gases resulting from combustion of the fuel and move upwards 15 eventually reaching a separator. 16 particles at the kiln outlet. Although some of the solids 17 pass through the separator, the mass of them 18 is captured and recycled back to the kiln. These solids together with 19 others, which fall out of the stream of upstream solids 15, are supplied to the BFB 4 which is fluidizing by means of the fluidizing medium 25 supplied through a distribution grid 26. The means for removing solids from the CFB and BFB (27 and 28 respectively) are provided in the relevant areas of the kiln floor.
El BFB se separa del CFB mediante un cerramiento 30. El mdice de reciclado de solidos 35 devueltos al CFB a traves de la valvula 40 se controla al controlar corrientes del medio fluidizante 45 y 46. El cerramiento se compone de tubos 50 que se enfnan normalmente por agua o vapor. Los tubos se protegen normalmente de la erosion y/o la corrosion por una capa protectora, normalmente formada por un material refractario sujeto por clavos soldados a los tubos. Los tubos que forman el cerramiento se extienden hacia arriba a una elevacion que permite la altura del BFB 4 requerida dentro del horno CFB 1. Por encima de la altura requerida, los tubos 50 se agrupan formando boquillas de aire secundarias 55. El aire 60 suministrado a estas boquillas se inyecta en el CFB mas alla del BFB 4, asf sus chorros 65 no desvfan corrientes de solidos 18 y 19 para que caigan sobre el BFB 4. La agrupacion de los tubos 50 permite formar las aberturas 70 a traves de las que las corrientes de solidos 18 y 19 caen sobre el BFB 4. Despues de alcanzar la pared 2b, los tubos 50 pueden formar parte de esta pared. Las boquillas de aire secundarias 75 en la pared opuesta 2d se ubican externamente al horno CFB 1. Ya que ningun iBHX se coloca por debajo de las boquillas 75, sus chorros 80 no provocan ningun efecto indeseado.The BFB is separated from the CFB by an enclosure 30. The recycling index of solids 35 returned to the CFB through the valve 40 is controlled by controlling fluidizing medium streams 45 and 46. The enclosure is composed of tubes 50 that are normally cooled by water or steam. The tubes are normally protected from erosion and / or corrosion by a protective layer, usually formed by a refractory material held by nails welded to the tubes. The tubes forming the enclosure extend upwards to a height that allows the height of the BFB 4 required inside the CFB furnace 1. Above the required height, the tubes 50 are grouped together forming secondary air nozzles 55. The supplied air 60 these nozzles are injected into the CFB beyond the BFB 4, so your jets 65 do not divert currents of solids 18 and 19 so that they fall on the BFB 4. The grouping of the tubes 50 makes it possible to form the openings 70 through which the streams of solids 18 and 19 fall on the BFB 4. After reaching the wall 2b, the tubes 50 can be part of this wall. The secondary air nozzles 75 on the opposite wall 2d are located externally to the CFB 1 furnace. Since no iBHX is placed below the nozzles 75, its jets 80 do not cause any undesired effects.
La Figura 3 ilustra una posible construccion de las boquillas de aire secundarias en el horno 55 formada por tubos 50. En la Figura 3, los tubos 50 que forman las boquillas de aire secundarias en el horno 55 se representan esquematicamente como lmeas unicas.Figure 3 illustrates a possible construction of the secondary air nozzles in the furnace 55 formed by tubes 50. In Figure 3, the tubes 50 forming the secondary air nozzles in the furnace 55 are schematically represented as single lines.
En una realización alternativa, ilustrada en las Figuras 4 y 5, el BFB 4 con el IBHX sumergido 3 se ubica en ambas paredes de horno opuestas 2b y 2d. Los tubos 50 del cerramiento 30 en ambos lados del horno se agrupan para formar boquillas de aire secundarias 55. Para suministrar el combustible, la cal y otras corrientes de solidos directamente sobre el CFB, el BFB en al menos una pared de horno (la pared 2d en esta realización de las Figuras 4 y 5) se rompe en varios compartimentos 80. Cada compartimento 80 se forma por una pared de horno 2d, cerramiento 30 y dos paredes laterales 85 (o una pared lateral 85 y una pared de horno 2a o 2c). Los compartimentos se separan entre sf por huecos 90 donde el combustible, la cal etc., se suministran.In an alternative embodiment, illustrated in Figures 4 and 5, the BFB 4 with the submerged IBHX 3 is located in both opposite furnace walls 2b and 2d. The tubes 50 of the enclosure 30 on both sides of the furnace are grouped to form secondary air nozzles 55. To supply the fuel, lime and other streams of solids directly on the CFB, the BFB on at least one furnace wall (the wall 2d in this embodiment of Figures 4 and 5) is broken into several compartments 80. Each compartment 80 is formed by an oven wall 2d, enclosure 30 and two side walls 85 (or a side wall 85 and a furnace wall 2a or 2 C). The compartments are separated from each other by holes 90 where fuel, lime etc., are supplied.
Aunque la aplicacion y principios de la invencion se han ilustrado por la provision de diversas realizaciónes espedficas, se entendera que esto no pretende que la presente invencion se limite a ello y que la invencion puede incorporarse de otra manera sin apartarse de tales principios En algunas realizaciónes de la invencion, algunas caractensticas de la invencion pueden a veces usarse para tomar ventaja sin un uso correspondiente de otras caractensticas. Por consiguiente, todos esos cambios y realizaciónes entran adecuadamente dentro del alcance de las siguientes reivindicaciones. Although the application and principles of the invention have been illustrated by the provision of various specific embodiments, it will be understood that this does not intend the present invention to be limited thereto and that the invention may be incorporated in another manner without departing from such principles. of the invention, some features of the invention can sometimes be used to take advantage without a corresponding use of other features. Accordingly, all such changes and embodiments adequately fall within the scope of the following claims.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/571,279 US8622029B2 (en) | 2009-09-30 | 2009-09-30 | Circulating fluidized bed (CFB) with in-furnace secondary air nozzles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2710825T3 true ES2710825T3 (en) | 2019-04-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES10179170T Active ES2710825T3 (en) | 2009-09-30 | 2010-09-24 | Circulating fluidized bed with secondary air nozzles in the furnace |
Country Status (18)
| Country | Link |
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| US (1) | US8622029B2 (en) |
| EP (1) | EP2312210B1 (en) |
| KR (1) | KR101715398B1 (en) |
| CN (1) | CN102032558B (en) |
| AR (1) | AR080549A1 (en) |
| AU (1) | AU2010224371B2 (en) |
| BG (1) | BG110761A (en) |
| BR (1) | BRPI1003902A2 (en) |
| CA (1) | CA2716054A1 (en) |
| CL (1) | CL2010001031A1 (en) |
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| HU (1) | HUE041619T2 (en) |
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| NZ (1) | NZ599084A (en) |
| RU (1) | RU2537482C2 (en) |
| TR (1) | TR201902018T4 (en) |
| UA (1) | UA104417C2 (en) |
Families Citing this family (7)
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| CN102889585A (en) * | 2012-06-06 | 2013-01-23 | 邵阳市金鹰锅炉有限公司 | Environment-friendly energy-saving vertical boiling boiler |
| WO2014074510A1 (en) * | 2012-11-06 | 2014-05-15 | Rec Silicon Inc | Method and apparatus to reduce contamination of particles in a fluidized bed reactor |
| CN104728856B (en) * | 2013-12-20 | 2017-03-01 | 中国科学院工程热物理研究所 | Interdigitated electrode structure water-cooled column and the burner hearth with this water-cooled column |
| EP3037723A1 (en) * | 2014-12-22 | 2016-06-29 | E.ON Sverige AB | Bed material for bubbling fluidised bed combustion |
| US20170356642A1 (en) * | 2016-06-13 | 2017-12-14 | The Babcock & Wilcox Company | Circulating fluidized bed boiler with bottom-supported in-bed heat exchanger |
| CN108240621A (en) * | 2017-09-05 | 2018-07-03 | 李建锋 | Circulating fluid bed boiler secondary air system |
| CN109297016A (en) * | 2018-10-10 | 2019-02-01 | 贵州新能源开发投资股份有限公司 | It is a kind of to mix the circulating fluidized bed boiler front water wall pipe structure for burning coal slime |
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| US4418650A (en) * | 1982-09-20 | 1983-12-06 | Foster Wheeler Energy Corporation | Fluidized bed heat exchanger having an insulated fluid cooled air distributor plate assembly |
| US4665864A (en) * | 1986-07-14 | 1987-05-19 | Foster Wheeler Energy Corporation | Steam generator and method of operating a steam generator utilizing separate fluid and combined gas flow circuits |
| SU1746129A1 (en) * | 1990-06-07 | 1992-07-07 | Уральский политехнический институт им.С.М.Кирова | Circulating fluidized-bed boiler |
| US5054436A (en) * | 1990-06-12 | 1991-10-08 | Foster Wheeler Energy Corporation | Fluidized bed combustion system and process for operating same |
| RU2028543C1 (en) * | 1990-10-22 | 1995-02-09 | Всероссийский теплотехнический научно-исследовательский институт | Circulating fluidized-bed furnace |
| US5239946A (en) * | 1992-06-08 | 1993-08-31 | Foster Wheeler Energy Corporation | Fluidized bed reactor system and method having a heat exchanger |
| JP3504324B2 (en) * | 1993-03-03 | 2004-03-08 | 株式会社荏原製作所 | Pressurized internal circulation type fluidized bed boiler |
| US5313913A (en) * | 1993-05-28 | 1994-05-24 | Ebara Corporation | Pressurized internal circulating fluidized-bed boiler |
| US5533471A (en) * | 1994-08-17 | 1996-07-09 | A. Ahlstrom Corporation | fluidized bed reactor and method of operation thereof |
| JP3016709B2 (en) * | 1995-03-01 | 2000-03-06 | 株式会社神戸製鋼所 | Combustion furnace and its heat recovery method |
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-
2009
- 2009-09-30 US US12/571,279 patent/US8622029B2/en not_active Expired - Fee Related
-
2010
- 2010-09-22 AU AU2010224371A patent/AU2010224371B2/en not_active Ceased
- 2010-09-23 RU RU2010139129/06A patent/RU2537482C2/en not_active IP Right Cessation
- 2010-09-24 TR TR2019/02018T patent/TR201902018T4/en unknown
- 2010-09-24 EP EP10179170.5A patent/EP2312210B1/en not_active Not-in-force
- 2010-09-24 HU HUE10179170A patent/HUE041619T2/en unknown
- 2010-09-24 ES ES10179170T patent/ES2710825T3/en active Active
- 2010-09-27 KR KR1020100093252A patent/KR101715398B1/en active IP Right Grant
- 2010-09-28 CA CA2716054A patent/CA2716054A1/en not_active Abandoned
- 2010-09-28 NZ NZ599084A patent/NZ599084A/en not_active IP Right Cessation
- 2010-09-28 BR BRPI1003902-3A patent/BRPI1003902A2/en active Search and Examination
- 2010-09-28 MX MX2010010674A patent/MX2010010674A/en active IP Right Grant
- 2010-09-29 AR ARP100103523A patent/AR080549A1/en active IP Right Grant
- 2010-09-29 BG BG10110761A patent/BG110761A/en unknown
- 2010-09-29 CL CL2010001031A patent/CL2010001031A1/en unknown
- 2010-09-29 UA UAA201011595A patent/UA104417C2/en unknown
- 2010-09-29 CN CN201010505853.2A patent/CN102032558B/en not_active Expired - Fee Related
- 2010-09-30 CO CO10121109A patent/CO6410028A1/en unknown
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| UA104417C2 (en) | 2014-02-10 |
| RU2010139129A (en) | 2012-03-27 |
| AU2010224371B2 (en) | 2016-05-05 |
| CN102032558A (en) | 2011-04-27 |
| HUE041619T2 (en) | 2019-05-28 |
| NZ599084A (en) | 2013-07-26 |
| MX2010010674A (en) | 2011-03-30 |
| KR20110035916A (en) | 2011-04-06 |
| RU2537482C2 (en) | 2015-01-10 |
| KR101715398B1 (en) | 2017-03-10 |
| EP2312210A2 (en) | 2011-04-20 |
| US8622029B2 (en) | 2014-01-07 |
| AR080549A1 (en) | 2012-04-18 |
| AU2010224371A1 (en) | 2011-04-14 |
| BRPI1003902A2 (en) | 2013-01-29 |
| CO6410028A1 (en) | 2012-03-30 |
| US20110073050A1 (en) | 2011-03-31 |
| CA2716054A1 (en) | 2011-03-30 |
| TR201902018T4 (en) | 2019-03-21 |
| EP2312210B1 (en) | 2018-12-05 |
| CL2010001031A1 (en) | 2011-07-15 |
| CN102032558B (en) | 2014-07-23 |
| EP2312210A3 (en) | 2014-11-12 |
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